Umar reported: I saw the Messenger of Allah, peace and blessings be upon him, spend the entire day suffering from hunger. The Prophet could not find even the worst dates with which to fill his stomach.
Source: Ṣaḥīḥ Muslim 2978
Grade: Sahih (authentic) according to Muslim
عن عمر قَالَ لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَظَلُّ الْيَوْمَ يَلْتَوِي مَا يَجِدُ دَقَلًا يَمْلَأُ بِهِ بَطْنَهُ
2978 صحيح مسلم كتاب الزهد والرقائق